Music-related meaning : to strike or pluck (something, such as the strings of a harp) to produce musical sound
If you thought smiting was all about violence, sometimes as perpetrated by angels, we have got some news for you.
While the word's most common meanings are "to strike sharply or heavily especially with the hand or with something held in the hand" and "to kill or severely injure by striking in such a way," and while the Bible does indeed include some accounts of angels smiting some unfortunate folks, the word smite can also be used when the thing being hit is a musical instrument, and when the way it's being hit isn't angry or mean. In fact, in musical smiting you don't even have to hit the thing: smite a harp or violin, and you might actually be plucking its strings.
This meaning of smite is too obscure for the Merriam-Webster.com dictionary, but Merriam-Webster Unabridged includes it, with the label "archaic" informing us that the use is no longer common.
Just because the use is outdated doesn’t mean you can't use it of course—as Upton Sinclair knew:
[Tamoszius Kuszleika] … taps authoritatively upon the side of his violin, then tucks it carefully under his chin, then waves his bow in an elaborate flourish, and finally smites the sounding strings and closes his eyes, and floats away in spirit upon the wings of a dreamy waltz.
— The Jungle, 1904